JPH1172217A - Controlling method of combustion in kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ignition of solid waste during the time when it is pushed by a pusher. SOLUTION: In a kiln 1 wherein a material to be combusted is pushed by a pusher 3 to be supplied into the furnace and auxiliary fuel is burned in a burner 4, the quantity of oil to be supplied to the burner 4 is reduced to the minimum at the time of a forward operation of the pusher 3, while it is controlled in a normal control mode at the time of backward movement of the pusher 3. The burner 4 is connected with a pump 7 through an oil supply system 6, while the pump 7 is connected with an oil quantity control device 8 controlling the quantity of oil to be discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kiln furnace used for incineration of municipal waste and waste, and more particularly to a method for controlling the combustion of a kiln furnace.

[0002]

2. Description of the Related Art In a rotary kiln furnace used for this kind of waste incineration, solid waste is introduced into the furnace by a pusher, and the waste oil is burned with a burner as an auxiliary fuel for treatment. In the furnace, the burnable material burns,
Rolling or sliding by the rotational movement of the kiln furnace itself, it is sequentially transferred in the direction of the outlet.

[0003]

In the conventional rotary kiln furnace described above, when the pusher moves forward to push and supply solid waste into the furnace, the flame of the waste oil burning by the burner generates solid fuel during the extrusion. There is a problem that the waste may be ignited directly, and the ignited flame flows back through the solid waste in the pusher, and the combustion of the solid waste starts in the pusher. As a result, the temperature of the outer wall of the pusher becomes high, which poses a danger to the worker, and the solid waste in the hopper connected to the pusher may be ignited, further deteriorating the pusher itself.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method for controlling combustion in a kiln furnace which prevents ignition of solid waste being extruded by a pusher.

[0005]

In order to solve the above-mentioned problems, a method for controlling combustion in a kiln according to the present invention is directed to a kiln in which an object to be burned is extruded and supplied into the furnace by a pusher, and an auxiliary fuel is burned in a burner. In the furnace, the amount of oil supplied to the burner when the pusher moves forward is suppressed to the minimum amount of oil,
The amount of oil supplied to the burner when the pusher moves backward is controlled in the normal control mode.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a rotary kiln furnace 1 is configured such that a furnace body 2 rotates around an axis,
The object to be burned moves sequentially in the direction of the outlet while rolling or sliding inside the furnace body 2. A pusher 3, a burner 4, and an air nozzle 5 are provided on the inlet side of the furnace body 2. The pusher 3 extrudes and supplies solid waste into the furnace, the burner 4 burns waste oil as auxiliary fuel, and the air nozzle 5 supplies combustion air into the furnace.

A pump 7 is connected to the burner 4 via an oil supply system 6.
Is connected to the pump 7, and an oil amount control device 8 for controlling the amount of oil to be discharged is connected to the pump 7. A fan 10 is connected to the air nozzle 5 via an air supply system 9.
0 is connected to an air amount control device 11 for controlling the amount of air to be blown. The pusher 3 is connected to a pusher control device 12 for controlling the evacuation operation.
Reference numeral 2 is connected to an oil amount control device 8 and an air amount control device 11 via a signal system.

Hereinafter, the operation of the above configuration will be described. When the solid waste is introduced into the furnace body 2, the pusher control device 12 moves the pusher 3 forward, and instructs the information to the oil amount control device 8 and the air amount control device 11 through a signal system. In a state where the solid waste is pushed out by the forward movement of the pusher 3, the oil amount control device 8 controls the pump 7 to suppress the oil amount supplied to the burner 4 to the minimum oil amount that can maintain the burner combustion. The air amount control device 11 controls the fan 10 to increase the amount of combustion air supplied from the air nozzle 5 into the furnace, and controls the burner air supply means (not shown) connected to the burner 4. The amount of combustion air to the burner 4 is suppressed.

Therefore, while the solid waste falls from the pusher 3 into the furnace, the flame burning in the burner 4 becomes small, so that it is possible to prevent the inside of the pusher 3 from igniting, and the amount of oil supplied from the burner 4 And the amount of air decreases, but the amount of air supplied from the air nozzle 5 increases,
Since a sufficient amount of air is supplied at the start of combustion, the total amount of forced air has little fluctuation, and stable furnace pressure control and continuous combustion can be performed.

When the pusher control device 12 retreats the pusher 3, the information is instructed to the oil control device 8 and the air control device 11 through a signal system. When the pusher 3 is retracted, the oil amount control device 8 controls the pump 7 in the normal control mode to supply a required amount of waste oil to the burner 4. The control of the oil amount in the normal control mode is performed by referring to a waste oil processing amount as a load, a furnace temperature and the like. The air amount control device 11 controls the fan 10 to suppress the amount of combustion air supplied from the air nozzle 5 into the furnace, and controls the burner air supply means (not shown) connected to the burner 4. The amount of combustion air to the burner 4 is increased.

[0011]

As described above, according to the present invention, the amount of oil supplied to the burner when the pusher moves forward is suppressed to the minimum amount, and the amount of oil supplied to the burner when the pusher moves backward is controlled in the normal control mode. , It is possible to prevent ignition of the solid waste being extruded by the pusher.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a kiln furnace according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary kiln furnace 2 Furnace 3 Pusher 4 Burner 5 Air nozzle 7 Pump 8 Oil control device 10 Fan 11 Air control device 12 Pusher control device

Claims (1)

[Claims] In a kiln furnace in which an object to be burned is pushed out and supplied by a pusher into a furnace and an auxiliary fuel is burned in a burner, the amount of oil supplied to the burner when the pusher moves forward is suppressed to a minimum oil amount. A combustion control method for a kiln furnace, wherein an amount of oil supplied to a burner during retreat is controlled in a normal control mode.